Technical Data Sheet
Application Guide
Approved
7141;9820
1,2
7141
polyurethane
^(ValidationDate)
Imperite 300
Product description
This is a two component chemically cured aliphatic polyester polyurethane coating. It has a high gloss finish with
excellent gloss retention. It has excellent chemical resistance. To be used as topcoat in atmospheric
environments.
Scope
The Application Guide offers product details and recommended practices for the use of the product.
The data and information provided are not definite requirements. They are guidelines to assist in smooth and
safe use, and optimum service of the product. Adherence to the guidelines does not relieve the applicator of
responsibility for ensuring that the work meets specification requirements.
Jotuns liability is in accordance with general product liability rules.
The Application Guide (AG) must be read in conjunction with the relevant specification, Technical Data Sheet
(TDS) and Safety Data Sheet (SDS) for all the products used as part of the coating system.
Referred standards
Reference is generally made to ISO Standards. When using standards from other regions it is recommended to
reference only one corresponding standard for the substrate being treated.
Surface preparation
The required quality of surface preparation can vary depending on the area of use, expected durability and if
applicable, project specification.
When preparing new surfaces, maintaining already coated surfaces or aged coatings it is necessary to remove all
contamination that can interfere with coating adhesion, and prepare a sound substrate for the subsequent
product. Inspect the surface for hydrocarbon and other contamination and if present, remove with an alkaline
detergent. Agitate the surface to activate the cleaner and before it dries, wash the treated area using fresh
water.
Paint solvents (thinners) shall not be used for general degreasing or preparation of the surface for painting due
to the risk of spreading dissolved hydrocarbon contamination. Paint thinners can be used to treat small localized
areas of contamination such as marks from marker pens. Use clean, white cotton cloths that are turned and
replaced often. Do not bundle used solvent saturated cloths. Place used cloths into water.
Process sequence
Surface preparation and coating should normally be commenced only after all welding, degreasing, removal of
sharp edges, weld spatter and treatment of welds is complete. It is important that all hot work is completed
before coating commences.
Coated surfaces
Verification of existing coatings including primers
When the surface is an existing coating, verify with technical data sheet and application guide of the involved
products, both over coatability and the given maximum over coating interval.
Organic primers/intermediates
Date of issue:
24 May 2016
Page: 1/6
This Application Guide supersedes those previously issued.
The Application Guide (AG) must be read in conjunction with the relevant specification, Technical Data Sheet (TDS) and Safety
Data Sheet (SDS) for all the products used as part of the coating system.
For your nearest local Jotun office, please visit our website at www.jotun.com.
1
Application Guide
Imperite 300
The surface of previous coats shall be free from contamination by water, hydrocarbon based products, wax, mud,
mortar droppings and loose, chalked and flaking coating.
Inspect the surface for hydrocarbon and other contamination and if present, remove with an alkaline emulsifying
detergent. Agitate the surface to activate the cleaner and before it dries, wash the treated area by low-pressure
waterjetting method to Wa 1 (ISO 8501-4) using fresh water. Surfaces not contaminated with hydrocarbon
deposits shall be washed to Wa 1 (ISO 8501-4) using fresh water to reduce surface chlorides.
When applied on coatings past maximum over coating interval light abrading may be required to achieve proper
intercoat adhesion.
Application
Acceptable environmental conditions - before and during application
Before application, test the atmospheric conditions in the vicinity of the substrate for the dew formation
according to ISO 8502-4.
Air temperature
Substrate temperature
10 - 40
10 - 60
°C
°C
Relative Humidity (RH)
10 - 85
%
The following restrictions must be observed:
•
•
•
•
Only apply the coating when the substrate temperature is at least 3 °C (5 °F) above the dew point
Do not apply the coating if the substrate is wet or likely to become wet
Do not apply the coating if the weather is clearly deteriorating or unfavourable for application or curing
Do not apply the coating in high wind conditions
Product mixing
3/15
1/5
Product mixing ratio (by volume)
Imperite 300 Comp A
3 part(s)
Imperite 300 Comp B
1 part(s)
Induction time and Pot life
Paint temperature
23 °C
Pot life
8h
The temperature of base and curing agent is recommended to be 18 °C or higher when the paint is mixed.
Thinner/Cleaning solvent
Thinner:
Date of issue:
Jotun Thinner No. 18
/ Jotun Thinner No. 19
24 May 2016
Page: 2/6
This Application Guide supersedes those previously issued.
The Application Guide (AG) must be read in conjunction with the relevant specification, Technical Data Sheet (TDS) and Safety
Data Sheet (SDS) for all the products used as part of the coating system.
For your nearest local Jotun office, please visit our website at www.jotun.com.
Application Guide
Imperite 300
Application data
Air Spray Equipment
0.2-0.35 MPa (40-50 psi)
Pressure at nozzle (minimum) :
Nozzle tip (inch/1000) :
1.1-1.8 mm (0.043-0.071")
Film thickness per coat
Typical recommended specification range
Dry film thickness
30
-
50
μm
Wet film thickness
55
-
90
μm
Theoretical spreading rate
19,3 - 11,6 m²/l
Wet film thickness (WFT) measurement and calculation
To ensure correct film thickness, it is recommended to measure the wet film thickness continuously during
application using a painter's wet film comb (ISO 2808 Method 1A). Use a wet-to-dry film calculation table to
calculate the required wet film thickness per coat.
A wet to dry film thickness chart is available on the Jotun Web site.
Dry film thickness (DFT) measurement
When the coating has cured to hard dry state the dry film thickness can be checked to SSPC PA 2 or equivalent
standard using statistical sampling to verify the actual dry film thickness. Measurement and control of the WFT
and DFT on welds is done by measuring adjacent to and no further than 15 cm from the weld.
Ventilation
Sufficient ventilation is very important to ensure proper drying/curing of the film.
Coating loss
The consumption of paint should be controlled carefully, with thorough planning and a practical approach to
reducing loss. Application of liquid coatings will result in some material loss. Understanding the ways that
coating can be lost during the application process, and making appropriate changes, can help reducing material
loss.
Some of the factors that can influence the loss of coating material are:
- type of spray gun/unit used
- air pressure used for airless pump or for atomization
- orifice size of the spray tip or nozzle
- fan width of the spray tip or nozzle
- the amount of thinner added
- the distance between spray gun and substrate
- the profile or surface roughness of the substrate. Higher profiles will lead to a higher "dead volume"
- the shape of the substrate target
- environmental conditions such as wind and air temperature
Date of issue:
24 May 2016
Page: 3/6
This Application Guide supersedes those previously issued.
The Application Guide (AG) must be read in conjunction with the relevant specification, Technical Data Sheet (TDS) and Safety
Data Sheet (SDS) for all the products used as part of the coating system.
For your nearest local Jotun office, please visit our website at www.jotun.com.
Application Guide
Imperite 300
Drying and Curing time
Substrate temperature
10 °C
Surface (touch) dry
Walk-on-dry
Dry to over coat, minimum
Dry to over coat, maximum, atmospheric
Dried/cured for service
10
40
24
72
10
h
h
h
h
d
23 °C
40 °C
3h
16 h
16 h
72 h
7d
1h
6h
8h
36 h
3d
Drying and curing times are determined under controlled temperatures and relative humidity below 85 %, and
at average of the DFT range for the product.
Surface (touch) dry: The state of drying when slight pressure with a finger does not leave an imprint or reveal
tackiness.
Walk-on-dry: Minimum time before the coating can tolerate normal foot traffic without permanent marks,
imprints or other physical damage.
Dry to over coat, minimum: The shortest time allowed before the next coat can be applied.
Dry to over coat, maximum, atmospheric: The longest time allowed before the next coat can be applied.
Dried/cured for service: Minimum time before the coating can be permanently exposed to the intended
environment/medium.
Maximum over coating intervals
Maximum time before thorough surface preparation is required. The surface must be clean and dry and suitable
for over coating. Inspect the surface for chalking and other contamination and if present, remove with an
alkaline detergent. Agitate the surface to activate the cleaner and before it dries, wash the treated area by lowpressure water jetting to Wa 1 (ISO 8501-4) using fresh water.
If maximum over coating interval is exceeded the surface should in addition be carefully roughened to ensure
good inter coat adhesion.
Areas for atmospheric exposure
Average temperature during
drying/curing
Itself
10 °C
23 °C
40 °C
extended extended extended extended
Other conditions that can affect drying / curing / over coating
Repair of coating system
Damages to the coating layers:
Prepare the area through sandpapering or grinding, followed by thorough cleaning/vacuuming. When the
surface is clean and dry the coating may be over coated by itself or by another product, ref. original
specification.
Always observe the maximum over coating intervals. If the maximum over coating interval is exceeded the
surface should be carefully roughened in order to ensure good intercoat adhesion.
Damages exposing bare substrate:
Remove all rust, loose paint, grease or other contaminants by spot blasting, mechanical grinding, water and/or
solvent washing. Feather edges and roughen the overlap zone of surrounding intact coating. Apply the coating
system specified for repair.
Date of issue:
24 May 2016
Page: 4/6
This Application Guide supersedes those previously issued.
The Application Guide (AG) must be read in conjunction with the relevant specification, Technical Data Sheet (TDS) and Safety
Data Sheet (SDS) for all the products used as part of the coating system.
For your nearest local Jotun office, please visit our website at www.jotun.com.
Application Guide
Imperite 300
Spot repair of this type of coating is very difficult in order to get the full effect of the performance. It is
recommended to repair entire areas.
Surface finish
Application of polyurethane topcoats in hot weather or on hot substrates can result in loss of gloss. Affected
areas should be lightly sanded and the coating reapplied.
Slower evaporating thinners could assist in solving the problem. To be discussed with your Jotun technical
representative.
Coating film continuity
When required by the specification, the coating shall be tested for film discontinuity according to ASTM D 5162,
test method A or B as appropriate for the actual dry film thickness.
All recorded defects shall be repaired by best practical means.
Quality assurance
The following information is the minimum required. The specification may have additional requirements.
- Confirm that all welding and other metal work has been completed before commencing pre-treatment and
surface preparation
- Confirm that installed ventilation is balanced and has the capacity to deliver and maintain the RAQ
- Confirm that the required surface preparation standard has been achieved and is held prior to coating
application
- Confirm that the climatic conditions are within recommendations in the AG, and are held during the application
- Confirm that the required number of stripe coats have been applied
- Confirm that each coat meets the DFT requirements in the specification
- Confirm that the coating has not been adversely affected by rain or other factors during curing
- Observe that adequate coverage has been achieved on corners, crevices, edges and surfaces where the spray
gun cannot be positioned so that its spray impinges on the surface at 90° angle
- Observe that the coating is free from defects, discontinuities, insects, abrasive media and other contamination
- Observe that the coating is free from misses, sags, runs, wrinkles, fat edges, mud cracking, blistering, obvious
pinholes, excessive dry spray, heavy brush marks and excessive film build
- Observe that the uniformity and colour are satisfactory
All noted defects shall be fully repaired to conform to the coating specification.
Caution
This product is for professional use only. The applicators and operators shall be trained, experienced and have
the capability and equipment to mix/stir and apply the coatings correctly and according to Jotun's technical
documentation. Applicators and operators shall use appropriate personal protection equipment when using this
product. This guideline is given based on the current knowledge of the product. Any suggested deviation to suit
the site conditions shall be forwarded to the responsible Jotun representative for approval before commencing
the work.
For further advice please contact your local Jotun office.
Health and safety
Please observe the precautionary notices displayed on the container. Use under well ventilated conditions. Do
not inhale spray mist. Avoid skin contact. Spillage on the skin should immediately be removed with suitable
cleanser, soap and water. Eyes should be well flushed with water and medical attention sought immediately.
Accuracy of information
Always refer to and use the current (last issued) version of the TDS, SDS and if available, the AG for this
product. Always refer to and use the current (last issued) version of all International and Local Authority
Standards referred to in the TDS, AG & SDS for this product.
Colour variation
Date of issue:
24 May 2016
Page: 5/6
This Application Guide supersedes those previously issued.
The Application Guide (AG) must be read in conjunction with the relevant specification, Technical Data Sheet (TDS) and Safety
Data Sheet (SDS) for all the products used as part of the coating system.
For your nearest local Jotun office, please visit our website at www.jotun.com.
Application Guide
Imperite 300
Some coatings used as the final coat may fade and chalk in time when exposed to sunlight and weathering
effects. Coatings designed for high temperature service can undergo colour changes without affecting
performance. Some slight colour variation can occur from batch to batch. When long term colour and gloss
retention is required, please seek advice from your local Jotun office for assistance in selection of the most
suitable top coat for the exposure conditions and durability requirements.
Reference to related documents
The Application Guide (AG) must be read in conjunction with the relevant specification, Technical Data Sheet
(TDS) and Safety Data Sheet (SDS) for all the products used as part of the coating system.
When applicable, refer to the separate application procedure for Jotun products that are approved to
classification societies such as PSPC, IMO etc.
Symbols and abbreviations
min = minutes
h = hours
d = days
°C = degree Celsius
° = unit of angle
µm = microns = micrometres
g/l = grams per litre
g/kg = grams per kilogram
m²/l = square metres per litre
mg/m² = milligrams per square metre
psi = unit of pressure, pounds/inch²
Bar = unit of pressure
RH = Relative humidity (% RH)
UV = Ultraviolet
DFT = dry film thickness
WFT = wet film thickness
TDS = Technical Data Sheet
AG = Application Guide
SDS = Safety Data Sheet
VOC = Volatile Organic Compound
MCI = Jotun Multi Colour Industry (tinted colour)
RAQ = Required air quantity
PPE = Personal Protective Equipment
EU = European Union
UK = United Kingdom
EPA = Environmental Protection Agency
ISO = International Standards Organisation
ASTM = American Society of Testing and Materials
AS/NZS = Australian/New Zealand Standards
NACE = National Association of Corrosion Engineers
SSPC = The Society for Protective Coatings
PSPC = Performance Standard for Protective Coatings
IMO = International Maritime Organization
Disclaimer
The information in this document is given to the best of Jotun's knowledge, based on laboratory testing and
practical experience. Jotun's products are considered as semi-finished goods and as such, products are often
used under conditions beyond Jotun's control. Jotun cannot guarantee anything but the quality of the product
itself. Minor product variations may be implemented in order to comply with local requirements. Jotun reserves
the right to change the given data without further notice.
Users should always consult Jotun for specific guidance on the general suitability of this product for their needs
and specific application practices.
If there is any inconsistency between different language issues of this document, the English (United Kingdom)
version will prevail.
Date of issue:
24 May 2016
Page: 6/6
This Application Guide supersedes those previously issued.
The Application Guide (AG) must be read in conjunction with the relevant specification, Technical Data Sheet (TDS) and Safety
Data Sheet (SDS) for all the products used as part of the coating system.
For your nearest local Jotun office, please visit our website at www.jotun.com.